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SIM7000 _Hardware Design _V1.04 2018-1-31
4.2 GSM/LTE Antenna Design Guide
Users should connect antennas to SIM7000’s antenna pads through micro-strip line or other types
of RF trace and the trace impedance must be controlled in 50Ω. SIMCom recommends that the
total insertion loss between the antenna pads and antennas should meet the following requirements:
Table 26: Trace loss
Frequency Loss
700MHz-960MHz <0.5dB
1710MHz-2170MHz <0.9dB
To facilitate the antenna tuning and certification test, a RF connector and an antenna matching
circuit should be added. The following figure is the recommended circuit.
R2
C1
模块
60
MAIN_ANT
GND
C2
61
R1
D1
TVS
Matching circuit
RF connector
Figure 26: Antenna matching circuit (MAIN_ANT)
In above figure, the components R1, C1, C2 and R2 are used for antenna matching, the values of
components can only be achieved after the antenna tuning and usually provided by antenna vendor.
By default, the R1, R2 are 0Ω resistors, and the C1, C2 are reserved for tuning. The component
D1 is a TVS for ESD protection, and it is optional for users according to application environment.
The RF test connector is used for the conducted RF performance test, and should be placed as close
as to the module’s MAIN_ANT pin. The traces impedance between SIM7000 and antenna must be
controlled in 50Ω.
Two TVS are recommended in the table below.
Table 27: Recommended TVS
Package Part Number Vender
0402 LXES15AAA1-153
Murata
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